chol_new.str NOTES This file can be use with CHARMM to stream in the topology and parm values. However, you must add the following MASS statements to the Topology File: MASS 300 CRL1 12.011000 C ! sp3 carbon with 1 H on a ring (-CH1-) MASS 301 CRL2 12.011000 C ! carbon of methylene group on a ring (-CH2-) MASS 302 HGA1 1.008000 H ! alphatic igor, 6/05 MASS 303 HGA2 1.008000 H ! alphatic igor, 6/05 If you are using NAMD, then you can manually copy and append all these sections to par file.